McQuay WGS190AW User Manual

OM WGS-5 WGS 130A to 190A 13
MicroTech II Controller
Software Version:WGSD30101E
Bios: 3.62
BOOT: 3.0F
System Architecture
The WGS MicroTech  distributed control system consists of multiple microprocessor-
based controllers that provide monitoring and control functions required for the controlled,
efficient operation of the chiller. The system consists of the following components:
 Unit Controller
, one per chiller  controls functions and settings that apply to the unit
and communicates with the other controllers. It is located in the control panel and is
labeled “UNIT CONTROL”.
 Circuit Controllers
for each compressor/circuit that control compressor functions and
settings specific to the circuit. The controllers are located in the control panel and are
labeled “CIRCUIT CONROL”.
In addition to providing all normal operating controls, the MicroTech II control system
monitors equipment protection devices on the unit and will take corrective action if the
chiller is operating outside of its normal design envelope. If an alarm condition develops,
the controller will shut down the compressor, or entire unit, and activate an alarm output.
Important operating conditions at the time an alarm condition occurs are retained in the
controller’s memory to aid in troubleshooting and fault analysis.
The system is protected by a password scheme that allows access only by authorized
personnel. The operator must enter the operator password into the controller’s keypad
before any setpoints can be altered.
PLAN Addressing
The pLAN (proprietary local area network) addressing is based on a commonly used
scheme among all applications using pLAN networked MicroTech II controllers. Only
three addresses are needed, and are designated as shown in the following table.
Controller Address Dip Sw 1 Position Dip Sw 2 Position Dip Sw 3 Position
Unit 5 Up Down Up
Circuit 1 1 Up Down Down
Circuit 2 2 Down Up Down
The Dip switches are located on the upper front of the controller above the screen.
Chiller
Unit Controller
4x20 LCD
Circuit Controller
4x20 LCD
Circuit Controller
4x20 LCD
Solid
State
Starter
Solid
State
Starter
BAS Interface-
Modbus,
BACnet,
Lonworks
Carel pLAN
RS485 RS485
RS485/
LON

McQuay WGS190AW Specifications

General

Brand	McQuay
Model	WGS190AW
Category	Chiller
Language	English